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Finding the Fourth Proportional to 381.40, 525.83 and 291.83

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Solution

The fourth proportional to 381.40, 525.83 and 291.83 is: 402.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.40 : 525.83 = 291.83 : x
  2. Step 2: Convert to fraction form
    381.40/525.83 = 291.83/x
  3. Step 3: Cross multiply
    381.40x = 525.83 × 291.83
  4. Step 4: Simplify right side
    381.40x = 153,451.95
  5. Step 5: Solve for x
    x = 153,451.95/381.40
  6. Step 6: Final answer
    x = 402.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.